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Finding the Fourth Proportional to 692.88, 956.13 and 390.04

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Solution

The fourth proportional to 692.88, 956.13 and 390.04 is: 538.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.88 : 956.13 = 390.04 : x
  2. Step 2: Convert to fraction form
    692.88/956.13 = 390.04/x
  3. Step 3: Cross multiply
    692.88x = 956.13 × 390.04
  4. Step 4: Simplify right side
    692.88x = 372,928.88
  5. Step 5: Solve for x
    x = 372,928.88/692.88
  6. Step 6: Final answer
    x = 538.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.